1 files changed, 28 insertions, 3 deletions
diff --git a/lib/html/ast.js b/lib/html/ast.js
index afecfce..96aa6c6 100644
--- a/lib/html/ast.js
+++ b/lib/html/ast.js
@@ -20,24 +20,49 @@ function elementWithTag(tag, children) {
     return {
         type: "element",
         tag: tag,
-        children: collapseFragments(children)
+        children: collapseFragments(children),
+        isEmpty: _.all(children, function(child) {
+            return child.isEmpty;
+        }),
+        appendChild: appendChild
+    };
+}
+    
+function appendChild(child) {
+    this.children.push(child);
+    this.isEmpty = this.isEmpty && child.isEmpty;
+}
+
+function selfClosingElement(tagName, attributes) {
+    return {
+        type: "selfClosingElement",
+        tagName: tagName,
+        attributes: attributes
     };
 }
 
 function text(value) {
     return {
         type: "text",
-        value: value
+        value: value,
+        isEmpty: !value
     };
 }
 
+var forceWrite = {
+    type: "forceWrite",
+    isEmpty: false
+};
+
 function collapseFragments(elements) {
     return _.flatten((elements || []).map(function(element) {
         return element.type === "fragment" ? element.children : [element];
-    }), true)
+    }), true);
 }
 
 exports.fragment = fragment;
 exports.element = element;
 exports.elementWithTag = elementWithTag;
+exports.selfClosingElement = selfClosingElement;
 exports.text = text;
+exports.forceWrite = forceWrite;